Power System for multi-voltage levels

ABSTRACT

Power system includes a power connector, a voltage detecting unit, a cell array, and a micro-controller unit. The power connector is used for providing at least one output voltage. The voltage detecting unit is coupled to the power connector for detecting voltage levels of at least one output voltage. The cell array is coupled to the power connector for providing energy of at least one output voltage. The cell array includes M cell packs coupled in parallel. Each cell pack includes six transistors and a power storage unit. The micro-controller unit is coupled to the voltage detecting unit and the cell array for controlling each transistor in all cell packs.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention illustrates a power system, and more particularly, a power system for inputting multi-voltage levels and/or outputting multi-voltage levels.

2. Description of the Prior Art

With the advancement of techniques, several portable electronic devices are widely adopted to our daily life, such as smart phone, personal digital assistant, tablet, micro-digital camera, and notebook. These portable electronic devices take advantage in high flexibility and high convenience. Specifically, in order to achieve high operation performance, enhancing a processing speed (i.e., floating processing speed) in conjunction with multi-functional processing core becomes a major trend of circuit design. However, with the improvement of processing speed, power consumption of the portable electronic device must be increased accordingly. Thus, when a capacity of a battery (or say, cell packs) is constrained to satisfy a microminiaturization volume, a working time (life span) of the portable electronic device may be reduced.

To extend the working time (life span) of the portable electronic device, a method is to use a power bank. Particularly, the power bank can be regarded as a portable battery with high capacity. By using the power bank to charge the portable electronic device, the working time (life span) of the portable electronic device can be extended. According to a standard of the power bank, an output voltage is fixed to 5V. An output current is fixed to 1A or 2A. Thus, the portable electronic device can be charged by using the standard power bank. However, the conventional power bank may not be able to charge another portable electronic device (i.e., smart phone or notebook) designed by a different standard because it may require a different charging voltage. In other words, the conventional power bank may not be compatible to the portable electronic device designed by a different standard. Further, a cell array of the conventional power bank is generally connected in series. Thus, when a cell (or some cells) of the cell array is abnormal, the output voltage becomes unstable, making the power bank unsafe.

Thus, it is important to develop a safe power system capable of inputting and/or outputting voltages with multi-voltage levels.

SUMMARY OF THE INVENTION

In an embodiment of the present invention, a power system is disclosed. The power system includes a power connector, a voltage detecting unit, a cell array, and a micro-controller. The power connector is used for providing at least one output voltage. The voltage detecting unit is coupled to the power connector for detecting voltage levels of the at least one output voltage. The cell array is coupled to the power connector for providing energy of the at least one output voltage. The cell array includes M cell packs coupled in parallel. Each cell pack includes a first transistor, a second transistor, a third transistor, a fourth transistor, a fifth transistor, a power storage unit, and a sixth transistor. The first transistor includes a first terminal, a control terminal for receiving a first control signal, and a second terminal. The second transistor includes a first terminal coupled to the first terminal of the first transistor, a control terminal for receiving a second control signal, and a second terminal. The third transistor includes a first terminal, a control signal for receiving a third control signal, and a second terminal coupled to the second terminal of the second transistor. The fourth transistor includes a first terminal coupled to a second high voltage terminal, a control terminal for receiving a fourth control signal, and a second terminal coupled to the second terminal of the first transistor. The fifth transistor includes a first terminal coupled to the second terminal of the fourth transistor, a control terminal for receiving a fifth control signal, and a second terminal. The power storage unit includes a first terminal coupled to the second terminal of the fifth transistor and a second terminal coupled to the second terminal of the third transistor. The sixth transistor includes a first terminal coupled to the second terminal of the power storage unit, a control unit for receiving a sixth control signal, and a second terminal coupled to a second low voltage terminal. The micro-controller is coupled to the voltage detecting unit and the cell array for controlling each transistor of the M cell packs of the cell array. M is a positive integer greater than 1.

In another embodiment of the present invention, a power system is disclosed. The power system includes a power connector, a voltage detecting unit, a cell array, and a micro-controller. The power connector is used for receiving at least one input voltage. The voltage detecting unit is coupled to the power connector for detecting voltage levels of the at least one input voltage. The cell array is coupled to the power connector for saving energy of the at least one input voltage. The cell array includes M cell packs coupled in parallel. Each cell pack includes a first transistor, a second transistor, a third transistor, a fourth transistor, a fifth transistor, a power storage unit, and a sixth transistor. The first transistor includes a first terminal, a control terminal for receiving a first control signal, and a second terminal. The second transistor includes a first terminal coupled to the first terminal of the first transistor, a control terminal for receiving a second control signal, and a second terminal. The third transistor includes a first terminal, a control signal for receiving a third control signal, and a second terminal coupled to the second terminal of the second transistor. The fourth transistor includes a first terminal coupled to a second high voltage terminal, a control terminal for receiving a fourth control signal, and a second terminal coupled to the second terminal of the first transistor. The fifth transistor includes a first terminal coupled to the second terminal of the fourth transistor, a control terminal for receiving a fifth control signal, and a second terminal. The power storage unit includes a first terminal coupled to the second terminal of the fifth transistor and a second terminal coupled to the second terminal of the third transistor. The sixth transistor includes a first terminal coupled to the second terminal of the power storage unit, a control unit for receiving a sixth control signal, and a second terminal coupled to a second low voltage terminal. The micro-controller is coupled to the voltage detecting unit and the cell array for controlling each transistor of the M cell packs of the cell array. M is a positive integer greater than 1.

These and other objectives of the present invention will no doubt become obvious to those of ordinary skill in the art after reading the following detailed description of the preferred embodiment that is illustrated in the various figures and drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 illustrates a block diagram of a power system according to an embodiment of the present invention.

FIG. 2 illustrates a circuit structure of a cell array of the power system in FIG. 1.

FIG. 3 illustrates a structure of two cell packs coupled in series of the power system in FIG. 1.

FIG. 4 illustrates a structure of two cell packs coupled in parallel of the power system in FIG. 1.

FIG. 5 illustrates a structure of four cell packs coupled in parallel of the power system in FIG. 1.

FIG. 6 illustrates a structure of four cell packs coupled in series of the power system in FIG. 1.

FIG. 7 illustrates a structure of four cell packs with pair-wised coupled in series and then coupled in parallel of the power system in FIG. 1.

FIG. 8 illustrates a structure of four cell packs with pair-wised coupled in parallel and then coupled in series of the power system in FIG. 1.

FIG. 9 illustrates a first layout method of eight cell packs of the power system in FIG. 1.

FIG. 10 illustrates a second layout method of eight cell packs of the power system in FIG. 1.

FIG. 11 illustrates a first method for outputting multi-voltage levels by using eight cell packs of the power system in FIG. 1.

FIG. 12 illustrates a second method for outputting multi-voltage levels by using eight cell packs of the power system in FIG. 1.

FIG. 13 illustrates an auto-balance energy mechanism of four cell packs of the power system in FIG. 1.

FIG. 14 illustrates a nested structure based cell array of the power system in FIG. 1.

FIG. 15 illustrates a multi-level nested structure based cell array of the power system in FIG. 1.

DETAILED DESCRIPTION

FIG. 1 illustrates a block diagram of a power system 100 according to an embodiment of the present invention. As shown in FIG. 1, the power system 100 includes a power connector 10, a voltage detecting unit 11, a cell array 13, and a micro-controller 12. The power connector 10 includes Q output terminals. The Q output terminals are used to output at least one output voltage. Here, Q is a positive integer greater than 1. The voltage detecting unit 11 is coupled to the power connector 10 for detecting voltage levels of the at least one output voltage. The cell array 13 is coupled to the power connector 10 for providing energy of the at least one output voltage. The micro-controller 12 is coupled to the voltage detecting unit 11 and the cell array 13 for controlling the cell array 13. In the power system 100, the micro-controller 12 can be any type of processor, such as an embedded processing chip, CPU or logical control unit. The cell array 13 includes power storage units. The power storage units can be any type of power storage units, such as batteries, capacitors, or lithium polymer cells. When a charging line of an electronic device is coupled to the power connector 10 by a user, the voltage detecting unit 11 can detect a standard voltage level of the electronic device. Then, the voltage detecting unit 11 transmits a message (or say, information) of the standard voltage level to the micro-controller 12. After the micro-controller 12 receives the message of the standard voltage level, the micro-controller 12 controls electrical connections of the power storage units of the cell array 13. By doing so, the power system 100 can provide an appropriate standard voltage level for charging various electronic devices, thereby achieving high compatibility. A circuit structure of the cell array 13 of the power system 100 is illustrated below.

FIG. 2 illustrates a circuit structure of the cell array 13 of the power system 100. As shown in FIG. 2, the cell array 13 includes M cell packs CP₁ to CP_(M) (i.e., a range of dotted line). The M cell packs CP₁ to CP_(M) are coupled in parallel. The first cell pack CP₁ includes a first transistor T₁₁, a second transistor T₁₂, a third transistor T₁₃, a fourth transistor T₁₄, a fifth transistor T₁₅, a sixth transistor T₁₆, and a power storage unit B₁. The first transistor T₁₁ includes a first terminal coupled to a first high voltage terminal VH₁, a control terminal for receiving a first control signal C₁₁, and a second terminal. The second transistor T₁₂ includes a first terminal coupled to the first terminal of the first transistor T₁₁, a control terminal for receiving a second control signal C₁₂, and a second terminal. The third transistor T₁₃ includes a first terminal coupled to a first low voltage terminal VL₁, a control signal for receiving a third control signal C₁₃, and a second terminal coupled to the second terminal of the second transistor T₁₂. The fourth transistor T₁₄ includes a first terminal coupled to a second high voltage terminal VH₂, a control terminal for receiving a fourth control signal C₁₄, and a second terminal coupled to the second terminal of the first transistor T₁₁. The fifth transistor T₁₅ includes a first terminal coupled to the second terminal of the fourth transistor T₁₄, a control terminal for receiving a fifth control signal C₁₅, and a second terminal. The power storage unit B₁ includes a first terminal coupled to the second terminal of the fifth transistor T₁₅, and a second terminal coupled to the second terminal of the third transistor T₁₃. The sixth transistor T₁₆ includes a first terminal coupled to the second terminal of the power storage unit B₁, a control unit for receiving a sixth control signal C₁₆, and a second terminal coupled to a second low voltage terminal VL₂. The second cell pack CP₂ includes a first transistor T₂₁, a second transistor T₂₂, a third transistor T₂₃, a fourth transistor T₂₄, a fifth transistor T₂₅, a sixth transistor T₂₆, and a power storage unit B₂. The difference between the first cell pack CP₁ and the second cell pack CP₂ is that the first terminal of the first transistor T₂₁ of the second cell pack CP₂ is coupled to a second terminal of the fourth transistor T₁₄ of the first cell pack CP₁. The first terminal of the third transistor T₂₃ of the second cell pack CP₂ is coupled to the second terminal of the power storage unit B₁ of the first cell pack CP₁. Similarly, an m^(th) cell pack CP_(m) includes 6 transistors T_(m1) to T_(m6) and a power storage unit B_(m). Particularly, a first terminal of a first transistor T_(m1) of the m^(th) cell pack CP_(m) is coupled to a second terminal of a fourth transistor T(_(m−1)4) of an (m−1)^(th) cell pack CP_(m'1). A first terminal of a third transistor T_(m3) of the m^(th) cell pack CP_(m) is coupled to a second terminal of a power storage unit B_(m−1) of the (m−1)^(th) cell pack CP_(m−1). Here, m is a positive integer and 2≦m≦M. Similarly, an M^(th) cell pack CP_(M) includes 6 transistors T_(M1) to T_(M6) and a power storage unit B_(M). A first terminal of a first transistor T_(M1) of the M^(th) cell pack CP_(M) is coupled to a second terminal of a fourth transistor T(_(M−1)4) of an (M−1)^(th) cell pack CP_(M−1). A first terminal of a third transistor T_(M3) of the M^(th) cell pack CP_(M) is coupled to a second terminal of a power storage unit B_(M−1) of the (M−1)^(th) cell pack CP_(M−1). In the embodiment, each transistor of the first cell pack CP₁ to the M^(th) cell pack CP_(M) can be an N-type metal-oxide-semiconductor or a P-type metal-oxide-semiconductor. All control signals of the first cell pack CP₁ to the M^(th) cell pack CP_(M) can be generated by the micro-controller 12. In other words, the micro-controller 12 can control an ON-state (i.e., a state of enable) and an OFF-state (i.e., a state of disable) of each transistor of the first cell pack CP₁ to the M^(th) cell pack CP_(M). Equivalently, electrical connections of the power storage units B₁ to B_(M) can be adjusted accordingly. In the following, some electrical connections of the power system 100 are illustrated.

FIG. 3 illustrates a structure of two cell packs coupled in series of the power system 100. As shown in FIG. 3, two cell packs CP₁ and CP₂ are considered. When the micro-controller 12 prepares to control the electrical connections between the power storage unit B₁ of the first cell pack CP₁ and the power storage unit B₂ of the second cell pack CP₂ to establish a serial connection, the micro-controller 12 generates control signals C₁₁ to C₁₆ corresponding to the first cell pack CP₁. The micro-controller 12 generates control signals C₂₁ to C₂₆ corresponding to the second cell pack CP₂. Here, the fifth transistor T₁₅ and the sixth transistor T₁₆ of the first cell pack CP₁ are enabled. The first transistor T₁₁, the second transistor T₁₂, the third transistor T₁₃, and the fourth transistor T₁₄ of the first cell pack CP₁ are disabled. Specifically, the second transistor T₂₂, the fourth transistor T₂₄, and the fifth transistor T₂₅ of the second cell pack CP₂ are enabled. The first transistor T₂₁, the third transistor T₂₃, and the sixth transistor T₂₆ of the second cell pack CP₂ are disabled. Thus, the power storage unit B₁ and the power storage unit B₂ establish a serial connection. The current can be outputted to a second high voltage terminal VH₂ (i.e., as a direction of arrow with bold line in FIG. 3) through the power storage unit B₁ and the power storage unit B₂ for charging the electronic device.

FIG. 4 illustrates a structure of two cell packs coupled in parallel of the power system 100. As shown in FIG. 3, two cell packs CP₁ and CP₂ are considered. When the micro-controller 12 prepares to control the electrical connections between the power storage unit B₁ of the first cell pack CP₁ and the power storage unit B₂ of the second cell pack CP₂ to establish a parallel connection, the micro-controller 12 generates control signals C₁₁ to C₁₆ corresponding to the first cell pack CP₁. The micro-controller 12 generates control signals C₂₁ to C₂₆ corresponding to the second cell pack CP₂. Here, the fifth transistor T₁₅ and the sixth transistor T₁₆ of the first cell pack CP₁ are enabled. The first transistor T₁₁, the second transistor T₁₂, the third transistor T₁₃, and the fourth transistor T₁₄ of the first cell pack CP₁ are disabled. Specifically, the first transistor T₂₁, the third transistor T₂₃, the fourth transistor T₂₄, and the fifth transistor T₂₅ of the second cell pack CP₂ are enabled. The second transistor T₂₂ and the sixth transistor T₂₆ of the second cell pack CP₂ are disabled. Thus, the power storage unit B₁ and the power storage unit B₂ establish a parallel connection. The current can be outputted to the second high voltage terminal VH₂ (i.e., as a direction of arrow with bold line in FIG. 4) through the power storage unit B₁ and the power storage unit B₂ for charging the electronic device.

FIG. 5 illustrates a structure of four cell packs coupled in parallel of the power system 100. As shown in FIG. 5, four cell packs CP₁ to CP₄ are considered. When the micro-controller 12 prepares to control the electrical connections among the power storage unit B₁ of the first cell pack CP₁, the power storage unit B₂ of the second cell pack CP₂, the power storage unit B₃ of the third cell pack CP₃, and the power storage unit B₄ of the fourth cell pack CP₄ to establish a parallel connection, the micro-controller 12 generates control signals C₁₁ to C₁₆ corresponding to the first cell pack CP₁. The micro-controller 12 generates control signals C₂₁ to C₂₆ corresponding to the second cell pack CP₂. The micro-controller 12 generates control signals C₃₁ to C₃₆ corresponding to the third cell pack CP₃. The micro-controller 12 generates control signals C₄₁ to C₄₆ corresponding to the fourth cell pack CP₄. Specifically, the fifth transistor T₁₅ and the sixth transistor T₁₆ of the first cell pack CP₁ are enabled. The first transistor T₁₁, the second transistor T₁₂, the third transistor T₁₃, and the fourth transistor T₁₄ of the first cell pack CP₁ are disabled. The first transistor T₂₁, the third transistor T₂₃, and the fifth transistor T₂₅ of the second cell pack CP₂ are enabled. The second transistor T₂₂, the fourth transistor T₂₄, and the sixth transistor T₂₆ of the second cell pack CP₂ are disabled. The first transistor T₃₁, the third transistor T₃₃, and the fifth transistor T₃₅ of the third cell pack CP₃ are enabled. The second transistor T₃₂, the fourth transistor T₃₄, and the sixth transistor T₃₆ of the third cell pack CP₃ are disabled. The first transistor T₄₁, the second transistor T₄₂, the third transistor T₄₃, the fourth transistor T₄₄, and the fifth transistor T₄₅ of the fourth cell pack CP₄ are enabled. The sixth transistor T₄₆ of the fourth cell pack CP₄ is disabled. Thus, the power storage unit B₁, the power storage unit B₂, the power storage unit B₃, and the power storage unit B₄ establish a parallel connection. The current can be outputted to the second high voltage terminal VH₂ (i.e., as a direction of arrow with bold line in FIG. 5) through the power storage unit B₁, the power storage unit B₂, the power storage unit B₃, and the power storage unit B₄ for charging the electronic device.

FIG. 6 illustrates a structure of four cell packs coupled in series of the power system 100. As shown in FIG. 6, four cell packs CP₁ to CP₄ are considered. When the micro-controller 12 prepares to control the electrical connections among the power storage unit B₁ of the first cell pack CP₁, the power storage unit B₂ of the second cell pack CP₂, the power storage unit B₃ of the third cell pack CP₃, and the power storage unit B₄ of the fourth cell pack CP₄ to become serial connection circuits, the micro-controller 12 generates control signals C₁₁ to C₁₆ corresponding to the first cell pack CP₁. The micro-controller 12 generates control signals C₂₁ to C₂₆ corresponding to the second cell pack CP₂. The micro-controller 12 generates control signals C₃₁ to C₃₆ corresponding to the third cell pack CP₃. The micro-controller 12 generates control signals C₄₁ to C₄₆ corresponding to the fourth cell pack CP₄. Specifically, the fifth transistor T₁₅ and the sixth transistor T₁₆ of the first cell pack CP₁ are enabled. The first transistor T₁₁, the second transistor T₁₂, the third transistor T₁₃, and the fourth transistor T₁₄ of the first cell pack CP₁ are disabled. The second transistor T₂₂ and the fifth transistor T₂₅ of the second cell pack CP₂ are enabled. The first transistor T₂₁, the third transistor T₂₃, the fourth transistor T₂₄, and the sixth transistor T₂₆ of the second cell pack CP₂ are disabled. The second transistor T₃₂ and the fifth transistor T₃₅ of the third cell pack CP₃ are enabled. The first transistor T₃₁, the third transistor T₃₃, the fourth transistor T₃₄, and the sixth transistor T₃₆ of the third cell pack CP₃ are disabled. The second transistor T₄₂, the fourth transistor T₄₄ and the fifth transistor T₄₅ of the fourth cell pack CP₄ are enabled. The first transistor T₄₁, the third transistor T₄₃, and the sixth transistor T₄₆ of the fourth cell pack CP₄ are disabled. Thus, the power storage unit B₁, the power storage unit B₂, the power storage unit B₃, and the power storage unit B₄ become serial connection. The current can be outputted to the second high voltage terminal VH₂ (i.e., as a direction of arrow with bold line in FIG. 6) through the power storage unit B₁, the power storage unit B₂, the power storage unit B₃, and the power storage unit B₄ for charging the electronic device.

FIG. 7 illustrates a structure of four cell packs with pair-wised coupled in series and then coupled in parallel of the power system 100. As shown in FIG. 7, four cell packs CP₁ to CP₄ are considered. When the micro-controller 12 prepares to control the electrical connections between the power storage unit B₁ of the first cell pack CP₁ and the power storage unit B₂ of the second cell pack CP₂ to become a first pair-wised serial connection circuit, and prepares to control the electrical connections between the power storage unit B₃ of the third cell pack CP₃ and the power storage unit B₄ of the fourth cell pack CP₄ to become a second pair-wised serial connection circuit, and then coupled two pair-wised serial connection circuits in parallel, the micro-controller 12 generates control signals C₁₁ to C₁₆ corresponding to the first cell pack CP₁. The micro-controller 12 generates control signals C₂₁ to C₂₆ corresponding to the second cell pack CP₂. The micro-controller 12 generates control signals C₃₁ to C₃₆ corresponding to the third cell pack CP₃. The micro-controller 12 generates control signals C₄₁ to C₄₆ corresponding to the fourth cell pack CP₄. Specifically, the fifth transistor T₁₅ and the sixth transistor T₁₆ of the first cell pack CP₁ are enabled. The first transistor T₁₁, the second transistor T₁₂, the third transistor T₁₃, and the fourth transistor T₁₄ of the first cell pack CP₁ are disabled. The second transistor T₂₂, the fourth transistor T₂₄, and the fifth transistor T₂₅ of the second cell pack CP₂ are enabled. The first transistor T₂₁, the third transistor T₂₃, and the sixth transistor T₂₆ of the second cell pack CP₂ are disabled. The fifth transistor T₃₅ and the sixth transistor T₃₆ of the third cell pack CP₃ are enabled. The first transistor T₃₁, the second transistor T₃₂, the third transistor T₃₃, and the fourth transistor T₃₄ of the third cell pack CP₃ are disabled. The second transistor T₄₂, the fourth transistor T₄₄, and the fifth transistor T₄₅ of the fourth cell pack CP₄ are enabled. The first transistor T₄₁, the third transistor T₄₃, and the sixth transistor T₄₆ of the fourth cell pack CP₄ are disabled. Thus, the power storage unit B₁ and the power storage unit B₂ become serial connection (i.e., a structure of the first pair-wised serial connection circuit). The power storage unit B₃ and the power storage unit B₄ become serial connection (i.e., a structure of the second pair-wised serial connection circuit). Particularly, two structures of pair-wised serial connection circuits are coupled in parallel. The current can be outputted to the second high voltage terminal VH₂ (i.e., as a direction of arrow with bold line in FIG. 7) through the power storage unit B₁, the power storage unit B₂, the power storage unit B₃, and the power storage unit B₄ for charging the electronic device.

FIG. 8 illustrates a structure of four cell packs with pair-wised coupled in parallel and then coupled in series of the power system 100. As shown in FIG. 8, four cell packs CP₁ to CP₄ are considered. When the micro-controller 12 prepares to control the electrical connections between the power storage unit B₁ of the first cell pack CP₁ and the power storage unit B₂ of the second cell pack CP₂ to become a first pair-wised parallel connection circuit, and prepares to control the electrical connections between the power storage unit B₃ of the third cell pack CP₃ and the power storage unit B₄ of the fourth cell pack CP₄ to become a second pair-wised parallel connection circuit, and then coupled two pair-wised parallel connection circuits in series, the micro-controller 12 generates control signals C₁₁ to C₁₆ corresponding to the first cell pack CP₁. The micro-controller 12 generates control signals C₂₁ to C₂₆ corresponding to the second cell pack CP₂. The micro-controller 12 generates control signals C₃₁ to C₃₆ corresponding to the third cell pack CP₃. The micro-controller 12 generates control signals C₄₁ to C₄₆ corresponding to the fourth cell pack CP₄. Specifically, the fifth transistor T₁₅ and the sixth transistor T₁₆ of the first cell pack CP₁ are enabled. The first transistor T₁₁, the second transistor T₁₂, the third transistor T₁₃, and the fourth transistor T₁₄ of the first cell pack CP₁ are disabled. The first transistor T₂₁, the third transistor T₂₃, and the fifth transistor T₂₅ of the second cell pack CP₂ are enabled. The second transistor T₂₂, the fourth transistor T₂₄, and the sixth transistor T₂₆ of the second cell pack CP₂ are disabled. The second transistor T₃₂ and the fifth transistor T₃₅ of the third cell pack CP₃ are enabled. The first transistor T₃₁, the third transistor T₃₃, the fourth transistor T₃₄, and the sixth transistor T₃₆ of the third cell pack CP₃ are disabled. The first transistor T₄₁, the third transistor T₄₃, the fourth transistor T₄₄, and the fifth transistor T₄₅ of the fourth cell pack CP₄ are enabled. The second transistor T₄₂ and the sixth transistor T₄₆ of the fourth cell pack CP₄ are disabled. Thus, the power storage unit B₁ and the power storage unit B₂ become parallel connection (i.e., a structure of the first pair-wised parallel connection circuit). The power storage unit B₃ and the power storage unit B₄ become parallel connection (i.e., a structure of the second pair-wised parallel connection circuit). Particularly, two structures of the pair-wised parallel connection circuits are coupled in series. The current can be outputted to the second high voltage terminal VH₂ (i.e., as a direction of arrow with bold line in FIG. 8) through the power storage unit B₁, the power storage unit B₂, the power storage unit B₃, and the power storage unit B₄ for charging the electronic device.

Since the micro-controller 12 can change electrical connections of the M cell packs of the power system 100, the adjustable electrical connections can be applied to avoid some abnormal cell packs (i.e., by floating some abnormal cell packs), thereby improving the operation security level. FIG. 9 illustrates a first layout method of eight cell packs of the power system 100. As shown in FIG. 9, eight cell packs CP₁ to CP₈ are considered. In FIG. 9, the fourth cell pack CP₄ is an abnormal cell pack. If the power system 100 uses the abnormal cell pack CP₄, the security level may be reduced. Thus, when the micro-controller 12 controls electrical connections of the cell packs CP₁ to CP₈, the abnormal cell pack CP₄ is rerouted by floating the abnormal cell pack CP₄ as an isolated cell pack. In the embodiment, the micro-controller 12 controls electrical connections among the first cell pack CP₁, the second cell pack CP₂, and the third cell pack CP₃ as connection in parallel. The micro-controller 12 controls electrical connections among the fifth cell packs CP₅, the sixth cell packs CP₆, the seventh cell packs CP₇, and the eighth cell packs CP₈ as connection in parallel. Specifically, two sets of parallel connection circuits of the cell packs (i.e., a set of cell packs CP₁ to CP₃, and another set of cell packs CP₅ to CP₈) are coupled in series. By doing so, after the electrical connections of the cell packs CP₁ to CP₈ is appropriately adjusted by the micro-controller 12, the abnormal cell pack CP₄ becomes a floating cell pack CP₄. Equivalently, the abnormal cell pack CP₄ is disabled for charging or discharging energy. Thus, the power system 100 can provide high security level.

FIG. 10 illustrates a second layout method of eight cell packs of the power system 100. As shown in FIG. 10, eight cell packs CP₁ to CP₈ are considered. In FIG. 10, the fourth cell pack CP₄ is an abnormal cell pack. If the power system 100 uses the abnormal cell pack CP₄, the security level is reduced. Thus, when the micro-controller 12 controls electrical connections of the cell packs CP₁ to CP₈, the abnormal cell pack CP₄ is rerouted by floating the abnormal cell pack CP₄ as an isolated cell pack. In the embodiment, the micro-controller 12 controls electrical connections among the first cell pack CP₁, the second cell pack CP₂, and the third cell pack CP₃ as connection in series. The micro-controller 12 controls electrical connections among the fifth cell packs CP₅, the sixth cell packs CP₆, the seventh cell packs CP₇, and the eighth cell packs CP₈ as connection in series. Specifically, two sets of serial connection circuits of the cell packs (i.e., a set of cell packs CP₁ to CP₃, and another set of cell packs CP₅ to CP₈) are coupled in parallel. By doing so, after the electrical connections of the cell packs CP₁ to CP₈ is appropriately adjusted by the micro-controller 12, the abnormal cell pack CP₄ becomes a floating cell pack CP₄. Equivalently, the abnormal cell pack CP₄ is disabled for charging or discharging energy. Thus, the power system 100 can provide high security level.

As indicated above, the power system 100 can provide high security level. Moreover, the power system 100 can also support multi-voltage levels output. FIG. 11 illustrates a first method for outputting multi-voltage levels by using eight cell packs of the power system 100. As shown in FIG. 11, eight cell packs CP₁ to CP₈ are considered. In the embodiment, 3 output voltages with different voltage levels can be respectively provided by 3 output terminals of the power connector 10 of the power system 100. In FIG. 11, the first cell pack CP₁ and the second cell pack CP₂ are coupled in parallel by the micro-controller 12. Thus, a first output terminal of the power connector 10 can be coupled to a low voltage terminal VL₁ and a high voltage terminal VH₁ (A) for outputting a first voltage level. The third cell pack CP₃ and the fourth cell pack CP₄ are coupled in series by the micro-controller 12. Thus, a second output terminal of the power connector 10 can be coupled to a low voltage terminal VL₂ and a high voltage terminal VH₂ for outputting a second voltage level. The fifth cell pack CP₅, the sixth cell pack CP₆, the seventh cell pack CP₇, and the eight cell pack CP₈ are coupled in parallel by the micro-controller 12. Thus, a third output terminal of the power connector 10 can be coupled to a low voltage terminal VL₁ and a high voltage terminal VH₁ (B) for outputting a third voltage level.

FIG. 12 illustrates a second method for outputting multi-voltage levels by using eight cell packs of the power system 100. As shown in FIG. 12, eight cell packs CP₁ to CP₈ are considered. In the embodiment, 3 output voltages with different voltage levels can be respectively provided by 3 output terminals of the power connector 10 of the power system 100. In FIG. 12, the first cell pack CP₁, the second cell pack CP₂, and the third cell pack CP₃ are coupled in parallel by the micro-controller 12. Thus, a first output terminal of the power connector 10 can be coupled to a low voltage terminal VL₁ and a high voltage terminal VH₁ (A) for outputting a first voltage level. The fourth cell pack CP₄ and the fifth cell pack CP₅ are coupled in series by the micro-controller 12. Thus, a second output terminal of the power connector 10 can be coupled to a low voltage terminal VL₂ and a high voltage terminal VH₂ for outputting a second voltage level. The sixth cell pack CP₆, the seventh cell pack CP₇, and the eighth cell pack CP₈ are coupled in series by the micro-controller 12. Thus, a third output terminal of the power connector 10 can be coupled to a low voltage terminal VL₂ and a high voltage terminal VH₁ (B) for outputting a third voltage level.

Although the embodiments of the power system 100 in FIG. 11 and FIG. 12 use 8 cell packs CP₁ to CP₈ to provide 3 different output voltage levels, the present invention is not limited by using 8 cell packs. For example, other embodiments can use any quantity of cell packs for outputting various output voltage levels. Additionally, when each power storage of the M cell packs provides electric energy equal to K volts, the power system 100 supports to provide the electric energy between K volts and (M×K) volts. In the following, energy balance technique is used to the power system 100 by automatically adjusting energy of all cell packs for increasing a life span of the power system 100. The energy balance technique of the power system 100 is illustrated below.

FIG. 13 illustrates an auto-balance energy mechanism of four cell packs of the power system 100. As shown in FIG. 13, four cell packs CP₁ to CP₄ are considered. Specifically, energy of a power storage unit B₃ of the third cell pack CP₃ is higher than energy of a power storage unit B₁ of the first cell pack CP₁, energy of a power storage unit B₂ of the second cell pack CP₂, and energy of a power storage unit B₄ of the fourth cell pack CP₄. The idea of auto-balance energy mechanism is to make all cell packs CP₁ to CP₄ have equal energy. To perform the auto-balance energy mechanism, the micro-controller 12 reforms electrical connections of four cell packs CP₁ to CP₄ to satisfy a closed-loop connection circuit. In the embodiment, the fifth transistor T₁₅ of the first cell pack CP₁ is enabled by the micro-controller 12. The first transistor T₁₁, the second transistor T₁₂, the third transistor T₁₃, the fourth transistor T₁₄, and the sixth transistor T₁₆ of the first cell pack CP₁ are disabled by the micro-controller 12. The first transistor T₂₁, the third transistor T₂₃, and the fifth transistor T₂₅ of the second cell pack CP₂ are enabled by the micro-controller 12. The second transistor T₂₂, the fourth transistor T₂₄, and the sixth transistor T₂₆ of the second cell pack CP₂ are disabled by the micro-controller 12. The first transistor T₃₁, the third transistor T₃₃, and the fifth transistor T₃₅ of the third cell pack CP₃ are enabled by the micro-controller 12. The second transistor T₃₂, the fourth transistor T₃₄, and the sixth transistor T₃₆ of the third cell pack CP₃ are disabled by the micro-controller 12. The first transistor T₄₁, the third transistor T₄₃, and the fifth transistor T₄₅ of the fourth cell pack CP₄ are enabled by the micro-controller 12. The second transistor T₄₂, the fourth transistor T₄₄, and the sixth transistor T₄₆ of the fourth cell pack CP₄ are disabled by the micro-controller 12. By doing so, a power storage device B₁, a power storage device B₂, a power storage device B₃, and a power storage device B₄ are coupled in parallel and thus form a closed-loop circuit. As a result, the current (energy) is transmitted from the power storage device B₃ to the power storage devices B₁, B₂, and B₄. Particularly, since the power storage device B₁, the power storage device B₂, the power storage device B₃, and the power storage device B₄ form the closed-loop circuit, when the power system 100 is under steady state, the power storage device B₁, the power storage device B₂, the power storage device B₃, and the power storage device B₄ have the same voltage level according to Kirchhoff Circuit Laws. Thus, working time (life span) of the power system 100 can be extended.

FIG. 14 illustrates a nested structure based cell array of the power system 100. As shown in FIG. 14, a cell array 13 of the power system 100 here is considered as a nested structure based cell array. The nested structure based cell array includes L nested cell packs BA₁ to BA_(L). Here, L is a positive integer greater than 1. A structure of each nested cell pack is similar to a structure of cell pack (or say, a sub-structure) in above embodiments. Thus, the illustration of the nested cell pack is omitted here. The difference between the nested cell pack and the cell pack is that the nested cell pack includes a power storage device (i.e., or say, a superset power storage unit). The power storage device of the nested cell pack includes M cell packs. For example, a first nested cell pack BA₁ includes a power storage device S₁. The power storage device S₁ includes a first cell pack CP₁ to an M^(th) cell pack CP_(M). A second nested cell pack BA₂ includes a power storage device S₂. The power storage device S₂ includes a first cell pack CP₁ to an M^(th) cell pack CP_(M). Similarly, an L^(th) nested cell pack BA_(L) includes a power storage device S_(L). The power storage device S_(L) includes a first cell pack CP₁ to an M^(th) cell pack CP_(M). Thus, the micro-controller 12 can control electrical connections of the first nested cell pack BA₁ to the L^(th) nested cell pack BA_(L). The micro-controller 12 can also control electrical connections of the first cell pack CP₁ to an M^(th) cell pack CP_(M) in each nested cell pack. Thus, when each power storage unit of the M cell packs provides an electric energy equal to K volts, the power system supports to provide the electric energy between K volts and (M×L×K) volts. Although the nested structure based cell array 13 of the power system 100 is exemplified as a twice recursive nested cell array (i.e., M cell packs forming a nested cell pack, and L nested cell packs forming a nested structure based cell array), the present invention is not limited by using a specific recursive number of the nested structure based cell array 13. For example, other embodiments of the power system 100 can use a nested structure based cell array 13 with arbitrary recursive number.

Besides using a single nested structure based cell array 13 to the power system 100, a multi-level nested structure based cell array is introduced in the following. FIG. 15 illustrates the multi-level nested structure based cell array of the power system 100. As shown in FIG. 15, the nested structure based cell array with two levels is applied to the power system 100. A first level nested structure based cell array LC₁ and a second level nested structure based cell array LC₂ are coupled each other. A switch SW is used for communicating between the first level nested structure based cell array LC1 and the second level nested structure based cell array LC2. Thus, the micro-controller 12 can control the switch SW for enabling the first level nested structure based cell array LC₁ and/or the second level nested structure based cell array LC₂ of the power system 100. In other words, When the power system 100 includes a nested structure based cell array 13 with R levels, each level of nested structure based cell array 13 including L nested cell packs, each nested cell pack including M cell packs, and each power storage unit of the M cell packs providing an electric energy equal to K volts, the power system 100 can support to provide the electric energy between K volts and (R×M×L×K) volts. Although the multi-level nested structure based cell array of the power system 100 is exemplified as a two-level nested cell array in FIG. 15, the present invention is not limited by using a nested structure based cell array 13 with fixed number of level. For example, other embodiments of the power system 100 can use a nested structure based cell array 13 with arbitrary number of level. By using multi-level nested structure based cell array, the power system 100 can provide larger dynamic range of output voltage, thereby increasing the compatibility.

In the embodiment of FIG. 11 to FIG. 14, the power system 100 can discharge the energy from some/all power storage units for charging the external electronic device. In other embodiments, the power system 100 can also be charged by an external power supply. Specifically, when the power system 100 is considered as a charging system, the power connector 10 in FIG. 1 includes Q input terminals. The Q input terminals are used to receive at least one input voltage. The cell array 13 is coupled to the power connector 10 for saving energy of the at least one input voltage. However, the structure of the cell array 13, the method for controlling electrical connections of the cell array 13 by the micro-controller 12, and the structure for expanding the cell array 13 to the nested cell pack, the nested structure based cell array, and the multi-level nested structure based cell array are similar to the illustrations in FIG. 2 to FIG. 15. Thus, they are omitted here. Particularly, when the power system 100 is considered as the charging system, all current directions are opposite to the current directions illustrated in FIG. 3 to FIG. 8. As known, the current is transmitted from a high voltage terminal to some/all power storage units for saving energy.

Additionally, the power system 100 of the present invention is not limited by using a plurality of transistors for enabling or disabling a current path. For example, each transistor of the plurality of transistors in the power system 100 can be replaced with any mechanical-type physical switch device or any electromagnetic-type physical switch device.

To sum up, the present invention discloses a power system having a capability of charging energy and/or discharging energy. The idea of design is to use a micro-controller for controlling electrical connections of all cell packs of the power system. By doing so, the power system is capable of inputting and/or outputting voltages with multi-voltage levels. Further, since all electrical connections of all cell packs are adjustable, some abnormal cell packs can be rerouted as floating cell packs, thereby increasing security level. Besides, all power storage units of the cell packs can be performed by an auto-balance energy mechanism. Thus, working time (life span) of the power system can be extended.

Those skilled in the art will readily observe that numerous modifications and alterations of the device and method may be made while retaining the teachings of the invention. Accordingly, the above disclosure should be construed as limited only by the metes and bounds of the appended claims. 

What is claimed is:
 1. A power system, comprising: a power connector configured to provide at least one output voltage; a voltage detecting unit coupled to the power connector and configured to detect voltage levels of the at least one output voltage; a cell array coupled to the power connector and configured to provide energy of the at least one output voltage, the cell array comprising M cell packs coupled in parallel, each cell pack comprising: a first transistor comprising: a first terminal; a control terminal configured to receive a first control signal; and a second terminal; a second transistor comprising: a first terminal coupled to the first terminal of the first transistor; a control terminal configured to receive a second control signal; and a second terminal; a third transistor comprising: a first terminal; a control signal configured to receive a third control signal; and a second terminal coupled to the second terminal of the second transistor; a fourth transistor comprising: a first terminal coupled to a second high voltage terminal; a control terminal configured to receive a fourth control signal; and a second terminal coupled to the second terminal of the first transistor; a fifth transistor comprising: a first terminal coupled to the second terminal of the fourth transistor; a control terminal configured to receive a fifth control signal; and a second terminal; a power storage unit comprising: a first terminal coupled to the second terminal of the fifth transistor; and a second terminal coupled to the second terminal of the third transistor; and a sixth transistor comprising: a first terminal coupled to the second terminal of the power storage unit; a control unit configured to receive a sixth control signal; and a second terminal coupled to a second low voltage terminal; and a micro-controller coupled to the voltage detecting unit and the cell array and configured to control each transistor of the M cell packs of the cell array; wherein M is a positive integer greater than
 1. 2. The power system of claim 1, wherein the power connector comprises Q output terminals, Q is a positive integer greater than 1, and the Q output terminals are configured to output the at least one output voltage.
 3. The power system of claim 1, wherein when each power storage unit of the M cell packs provides electric energy equal to K volts, the power system supports to provide the electric energy between K volts and (M×K) volts.
 4. The power system of claim 1, wherein a first terminal of a first transistor of a first cell pack of the M cell packs is coupled to a first high voltage terminal, a first terminal of a third transistor of the first cell pack of the M cell packs is coupled to a first low voltage terminal, a first terminal of a first transistor of an m^(th) cell pack of the M cell packs is coupled to a second terminal of a fourth transistor of an (m−1)^(th) cell pack of the M cell packs, a first terminal of a third transistor of the m^(th) cell pack of the M cell packs is coupled to a second terminal of a power storage unit of the (m−1)^(th) cell pack of the M cell packs, m is a positive integer and 2≦m≦M.
 5. The power system of claim 1, wherein each transistor of the plurality of transistors is an N-type metal-oxide-semiconductor or a P-type metal-oxide-semiconductor.
 6. The power system of claim 1, wherein each transistor of the plurality of transistors is formed by at least one mechanical switch or at least one electromagnetic switch.
 7. A power system, comprising: a power connector configured to receive at least one input voltage; a voltage detecting unit coupled to the power connector and configured to detect voltage levels of the at least one input voltage; a cell array coupled to the power connector and configured to save energy of the at least one input voltage, the cell array comprising M cell packs coupled in parallel, each cell pack comprising: a first transistor comprising: a first terminal; a control terminal configured to receive a first control signal; and a second terminal; a second transistor comprising: a first terminal coupled to the first terminal of the first transistor; a control terminal configured to receive a second control signal; and a second terminal; a third transistor comprising: a first terminal; a control signal configured to receive a third control signal; and a second terminal coupled to the second terminal of the second transistor; a fourth transistor comprising: a first terminal coupled to a second high voltage terminal; a control terminal configured to receive a fourth control signal; and a second terminal coupled to the second terminal of the first transistor; a fifth transistor comprising: a first terminal coupled to the second terminal of the fourth transistor; a control terminal configured to receive a fifth control signal; and a second terminal; a power storage unit comprising: a first terminal coupled to the second terminal of the fifth transistor; and a second terminal coupled to the second terminal of the third transistor; and a sixth transistor comprising: a first terminal coupled to the second terminal of the power storage unit; a control unit configured to receive a sixth control signal; and a second terminal coupled to a second low voltage terminal; and a micro-controller coupled to the voltage detecting unit and the cell array and configured to control each transistor of the M cell packs of the cell array; wherein M is a positive integer greater than
 1. 8. The power system of claim 7, wherein the power connector comprises Q input terminals, Q is a positive integer greater than 1, and the Q input terminals are configured to receive the at least one input voltage.
 9. The power system of claim 7, wherein when each power storage unit of the M cell packs saves electric energy equal to K volts, the power system supports to save electric energy between K volts and (M×K) volts.
 10. The power system of claim 7, wherein a first terminal of a first transistor of a first cell pack of the M cell packs is coupled to a first high voltage terminal, a first terminal of a third transistor of the first cell pack of the M cell packs is coupled to a first low voltage terminal, a first terminal of a first transistor of an m^(th) cell pack of the M cell packs is coupled to a second terminal of a fourth transistor of an (m−1)^(th) cell pack of the M cell packs, a first terminal of a third transistor of the m^(th) cell pack of the M cell packs is coupled to a second terminal of a power storage unit of the (m−1)th cell pack of the M cell packs, m is a positive integer and 2≦m≦M.
 11. The power system of claim 7, wherein each transistor of the plurality of transistors is an N-type metal-oxide-semiconductor or a P-type metal-oxide-semiconductor.
 12. The power system of claim 7, wherein each transistor of the plurality of transistors is formed by at least one mechanical switch or at least one electromagnetic switch. 